Table 4.
The effects of birth weight on the incidence of respiratory complications in male and female EPIs (%[diagnosed No./assessed No.]).
| Birth weight at delivery (g) | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
| Male (No. = 240) | Female (No. = 199) | P value | Male (No. = 148) | Female (No. = 148) | P value | |
| RDS | ||||||
| <750 | 97.0 (32/33) | 97.8 (44/45) | 1.000a | 96.0 (24/25) | 100.0 (24/24) | 1.000b |
| 750~999 | 97.9 (143/146) | 91.7 (110/120) | 0.038a | 99.0 (95/96) | 90.1 (82/91) | 0.018a |
| ≥1000 | 93.4 (57/61) | 88.2 (30/34) | 0.624a | 92.6 (25/27) | 87.9 (29/33) | 0.863a |
| BPD | ||||||
| <750 | 100.0 (9/9) | 87.5 (14/16) | 0.520b | 100.0 (8/8) | 83.3 (5/6) | 0.429b |
| 750~999 | 98.7 (77/78) | 84.2 (48/57) | <0.01a | 98.0 (49/50) | 83.3 (35/42) | 0.034a |
| ≥1000 | 87.5 (42/48) | 79.2 (19/24) | 0.354 | 95.0 (19/20) | 82.6 (19/23) | 0.431a |
| Moderate to severe BPD | ||||||
| <750 | 55.6 (5/9) | 31.3 (5/16) | 0.397b | 62.5 (5/8) | 16.7 (1/6) | 0.138b |
| 750~999 | 43.6 (34/78) | 31.6 (18/57) | 0.157 | 50.0 (25/50) | 28.6 (12/42) | 0.037 |
| ≥1000 | 29.2 (14/48) | 20.8 (5/24) | 0.449 | 40.0 (8/20) | 21.7 (5/23) | 0.193 |
a Continuity correction Chi-square tests; b Fisher’s exact tests; EPIs, extremely preterm infants; RDS, respiratory distress syndrome; BPD, bronchopulmonary dysplasia.